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Running the agent with an http/s proxy is a paid feature. If this is unexpected, verify that there is no proxy_url value in your ngrok configuration file and that the http_proxy environment variable is not set. If you need this capability, upgrade to new plan at: https://dashboard.ngrok.com/billing/subscriptionAdditional Information
If you are seeing an error such as:ERROR: Invalid configuration property value for 'http_proxy': URL scheme must be 'http' or 'https', this means that you have a value set for the environment variable http_proxy or http_proxy_env and that it does not include the scheme in he value. If you are trying to use a proxy with ngrok, try updating the value of the env variable to include the proper scheme. If you are not trying to use ngrok with a proxy, then you will need to unset those env values before starting ngrok.